c# - 我怎样才能异步调用这个网络服务？

Question

在 Visual Studio 中，我在此 URL 上创建了一个网络服务(并选中了“生成异步操作”):

http://www.webservicex.com/globalweather.asmx

并且可以同步获取数据，但是异步获取数据的语法是什么？

using System.Windows;
using TestConsume2343.ServiceReference1;
using System;
using System.Net;

namespace TestConsume2343
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            GlobalWeatherSoapClient client = new GlobalWeatherSoapClient();

            //synchronous
            string getWeatherResult = client.GetWeather("Berlin", "Germany");
            Console.WriteLine("Get Weather Result: " + getWeatherResult); //works

            //asynchronous
            client.BeginGetWeather("Berlin", "Germany", new AsyncCallback(GotWeather), null);
        }

        void GotWeather(IAsyncResult result)
        {
            //Console.WriteLine("Get Weather Result: " + result.???); 
        }

    }
}

回答:

感谢 TLiebe，根据您的 EndGetWeather 建议，我能够让它像这样工作:

using System.Windows;
using TestConsume2343.ServiceReference1;
using System;

namespace TestConsume2343
{
    public partial class Window1 : Window
    {
        GlobalWeatherSoapClient client = new GlobalWeatherSoapClient();

        public Window1()
        {
            InitializeComponent();
            client.BeginGetWeather("Berlin", "Germany", new AsyncCallback(GotWeather), null);
        }

        void GotWeather(IAsyncResult result)
        {
            Console.WriteLine("Get Weather Result: " + client.EndGetWeather(result).ToString()); 
        }

    }
}

Answer 1

我建议使用自动生成的代理提供的事件，而不是乱用 AsyncCallback

public void DoWork()
{
    GlobalWeatherSoapClient client = new GlobalWeatherSoapClient();
    client.GetWeatherCompleted += new EventHandler<WeatherCompletedEventArgs>(client_GetWeatherCompleted);
    client.GetWeatherAsync("Berlin", "Germany");
}

void client_GetWeatherCompleted(object sender, WeatherCompletedEventArgs e)
{
    Console.WriteLine("Get Weather Result: " + e.Result);
}